import java.util.*;
class Example2_5{
	public static void main (String args[]){
		int start=0,end,middle;
		int a[]={12,45,67,89,123,-45,67};
		int N=a.length;
		for(int i=0;i<N;i++){
				for(int j=i+1;j<N;j++){
					if(a[j]<a[i]){
						int t=a[j];
						a[j]=a[i];
						a[i]=t;
					}
				}
		}
		Scanner scanner=new Scanner(System.in);
		System.out.println("输入整数，程序判断该整数是否在数组中：");
		int number=scanner.nextInt();
		int count=0;
		end=N;
		middle=(start+end)/2;
		while(number!=a[middle]){
			if(number>a[middle])
				start=middle;
			else if(number<a[middle])
				end=middle;
			middle=(start+end)/2;
			count++;
			if(count>N/2)
			break;
		}
		if(count>N/2)
		System.out.printf("%d is not in.\n",number);
		else
		System.out.printf("%d is in.\n",number);
	}
}
